Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual era a tonelagem em 30 de março de 1943?
 ###Tabelas: CREATE TABLE words_derived_from_non-indo-european_languages (words_derived_from_non-indo-european_languages_id AUTO_INCREMENT PRIMARY KEY, English VARCHAR, German VARCHAR, Dutch VARCHAR, Icelandic VARCHAR, Latin VARCHAR, Greek VARCHAR, Russian VARCHAR) CREATE TABLE past_board_members (past_board_members_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Chairman VARCHAR, Artistic Director VARCHAR, Performance Liaison VARCHAR, Secretary VARCHAR, Business manager VARCHAR, Production Stagemanager VARCHAR, Dramaturge VARCHAR, Public Relations VARCHAR, First/Second Year Rep. VARCHAR, Male Rep. VARCHAR) CREATE TABLE raiding_history (raiding_history_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Ship VARCHAR, Nationality VARCHAR, Tonnage INT, Fate VARCHAR) CREATE TABLE 1999_squad_statistics (1999_squad_statistics_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Position VARCHAR, Tries INT, Goals INT, Points INT) CREATE TABLE all-time_statistics (all-time_statistics_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Nationality VARCHAR, Position VARCHAR, Los Angeles Sol career VARCHAR, Appearances INT, Starts INT, Minutes INT, Goals INT, Assists INT)  
SELECT AVG Tonnage FROM raiding_history WHERE Date = 30 march 1943